A spiral slip joint pops apart during a pressure test
A round joint that pops during testing is a mechanical engagement problem first, sealing problem second. Shut down, inspect overlap/fit/fasteners, then reassemble and seal per the pressure class/project method.
Do not try to hold a pressure-class joint together with foil tape alone.
Check
Depressurize/shut down before touching the failed joint.
Check insertion/overlap, roundness, coupler fit, and whether the pipe is under tension or misaligned.
Verify fastener type/quantity/spacing against project/spec/shop standard rather than guessing.
Clean failed tape/sealant and reseal with the approved system after mechanical fastening.
Retest or recheck under safe conditions before covering.
Steps
Depressurize/shut down before touching the failed joint.
Check insertion/overlap, roundness, coupler fit, and whether the pipe is under tension or misaligned.
Verify fastener type/quantity/spacing against project/spec/shop standard rather than guessing.
Clean failed tape/sealant and reseal with the approved system after mechanical fastening.
Retest or recheck under safe conditions before covering.
Say this to your foreman
The spiral slip joint at [location] popped during the pressure test. I checked engagement, coupler fit, roundness, and fasteners. Do you want it rebuilt with approved fasteners/sealant or replaced with a proper coupler/section?